Think you can't sing? Think again. Can you hum or sing the pitches as you tune your guitar? Can you sing along with your car radio? You can? Great! Now we know you can sing. It's good to get that out of the way. Come on in and wail away.

To have a good singing voice, you'll need to warm up your voice before singing and avoid vocal strain while singing to keep control. Recording yourself, listening for errors, and letting others listen to you sing will also make it easier to improve your singing voice.

1.Relax your vocal chords before you start singing.
2.Don't force the high notes.
3.Drink plenty cool water (not iced) or have hot/warm tea: This is best for your vocal cords because it simply hydrates them and helps clear away excess mucus.
4.Practice breathing deeply.
5.Practice phrasing.
6.Record yourself

Singing & playing the guitar is a challenge. It is worth developing both independently, as well as together, so that you give proper attention to each aspect of both "instruments". So many sure you are developing your singing voice away from the guitar as well as with it, this will make the quality of what you sing much better when you do combine the two.

Hello Dear,
As a beginner you have to learn how to play a guitar, have to know some knowledge about the guitar tuner buttons & strings. If you have the passion on you you will surely play guitar. Yeah, of course singing will help you to progress & you should have a good ear also.